Stamp-mill.



PATENTED DEC. 10, 1907.

F. I. MATTHEWS.

STAMP MILL. I APPL IGA'IIOH FILED NOV. 28.. 190B.

2 SHEETS-SHEET 2.

WITNESSES o., wnsnma'iou, n. c.

PATENTED DEC. 10, 1907- F. I. MATTHBWS.

JSTAMP MILL.

APPLICATION IILBD NOV.2B,1906.

2 SHEETS-SHEET 1.

WITNBSSI ES w umrnn STATES PATENT onnron.

FRANCIS I. MATTHEWS, OF OAKLAND, CALIFORNIA, ASSIGNOR TO OAKLAND STAMP MILL 00., OF OAKLAND, CALIFORNIA, A CORPORATION.

STAMP-MILL.

To all whom it may concern."

Be it known that I, FRANoIs I. MATTHEWS, citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Im rovements in Stamp-Mills, of which the fol owing is a specification.

My invention relates to improvements in mills of that class which are designed for crushing ore and the like.

It consists in the combination of parts and details of construction which will be more fully explained by reference to the accompanying drawings, in which Figure 1 is a front elevation in partial section showing one battery element, stamp, and connections. Fig. 2 is a similar elevation at right angles with Fig. 1. Fig. 3 is .a plan view of one turnable mechanism. Fig. 4 is a section on line XX ofv Fig. 5. Fig. 5 is a plan view of another turning mechanism. Fig. 6 is a view of the removable sleeve on the stamp stem.

A is a mortar of any suitable description having dies 2 fixed in the lower part, stamp stems 3 carrying stamp-heads and shoes 4, which stems and shoes are vertically reciprocal to crush the ore which is fed into the mortar through-a suitable inlet so as to pass between the shoes and dies; and the material when sufficiently pulverized passes out through screens upon the sides of the mortar and is received into conveyers which deliver it to other parts of the apparatus.

6 are vertical standards or equivalent supports, having fixed transversely to them the timbers-7, with boxes 8 through which the stamp stems are slidable.

9 is a shaft journaled in suitable boxes as at 10, having a belt-pulley or equivalent 11, through which power is transmitted to revolve the shaft.

13 is a disk having a radial slot or its equivalent in which a block 14'is slidable, said block carrying a crank pin 15 to which the upper end of a connecting rod 16 is attached. The lower end of the rod connects with the center of a segmental-leaf-spring 17. Swiveled shackles 18 are connected with the separated ends of the spring, and between these shackles extends the flexible connection 19. The central portion of this connection passes through an open channel of the box 20, which projects to one side of and is formed with a sleeve 21. The stampstem 3 passes through Specification of Letters Patent.

Application filed November 28. 1906. Serial No. 345,554,

1 during its reciprocation.

Patented Dec. 10, 1907.

this sleeve and is loosely turnable therein. It will be seen that by the employment of the box 20, the spring 17 and connections are in line with the crank pin and the box', and are located at one side of the line of travel of .the stamp-stem.

have shown the upper ends of the stems as grooved or slotted in an inclined manner, as shown at 22. This grooved portion of the stamp stem is slidable through a collar 23 having corresponding feathers 24 projecting so as to engage with the grooves or channels of the stems.

It will be understood that the stem might have spirally disposedfeathers fixed to it, and corresponding grooves or channels might be made in the collar, the result being substantially the same. The outer periphery of the collar isengaged by any suitable clutch mechanism which will act to revolve the stamp stem intermittently in one direction Such a device including pawls 26 acted upon by springs 27 and engaging teeth 25 upon the periphery of the collar is shown in Fig. 3, but I prefer the mechanism shown in Figs. 4 and 5, in which rollers 30 or equivalent balls are loosely contained in chambers 31 in 'an outer casing 32, these chambers being convergent so as to bind the rollers between the outer casing and the periphery'of the collar and thus turn the collar and stem in one direction and leave them free to be turned in the opposite direction.

The casing 32 is carried upon a yoke or frame 33, the ends of which are adapted to be bolted to the timber 7, or othercontiguous fixed part, as shown in Figs. 1 and 2. The casing is secured to the frame, by bolts 34 which are screwed firmly into the frame, and pass through holes in the casing, which holes are sufficiently larger than the bolt to allow the casing to move freely with relation to the frame, and in unison with the movements of the stamp stem, so that if the stem should get out of alinement with the frame or move irregularly, the relation of the collar, stamp stem and turning devices will be maintained. These movements are controlled by a link 35 which connects a lug 35" of the casing with a support 35 on the frame. In order to reduce the expense of repairs and time, I have shown in Fig. 6, a sleeve 36 fixed to the stem 3 and having the spiral grooves or channels 22 out upon its periphery so as to engage with the lugs or feathers of the collar, instead of forming the grooves directly upon the stem. By this construction the more expensive stem is preserved from wear and the less expensive sleeves and collars are easily replaced. In order to permit these movements, and still maintain the connection between the stem 3 and box 21 through which reciprocating motion is transmitted to the stem, I have shown collars 28 fixed to the stamp-stem above and below the sleeve 21, and sufliciently free therefrom to allow the stem to turn freely within the sleeve, when by the action of the pawl and ratchet mechanism the stem and its stamp is being turned. These collars 28 are adjustably fixed to the stem by suitable clamping bolts or keys, and when the stamps and dies become worn by the action of the material which is being pulverized, these collars may be loosened and moved upon the stemand again secured thereto, thus insuring the proper relation of the stamps to the dies.

It is preferable that the stamps do not rest upon the dies when they are at rest, but they should be slightly above the dies so that the action of the spring and flexible connection will be by reason of the momentum and inertia of the moving stamps, to give a sharp, quick blow, resembling that of a hand-operated hammer.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is

1. In an ore crushing mill of the character described, a guided rising and falling stamp stem, collars adj ustably fixed upon the stem, a sleeve located between the collars through which the stem is loosely turnable, said sleeve having an oifset horizontally channeled box, a segmental bow spring, a crank shaft and connection between the crank and the center of said spring, links connected with the ends of the spring, a flexible yielding band extending between the said links and loosely through the channel of the box, a fixed guide, a transversely movable casing carried thereby, through which casing the stamp stem passes, a clutch mechanism carried by the casing, a spirally grooved sleeve fixed to the stamp stem, and corresponding lugs actuated by the clutch mechanism and engaging the grooved sleeve.

2. In a stamp mill, a guided rising and falling stamp stem, a sleeve within which the stem is loosely turnable, collars fixed to the stem above and below the sleeve to adjust said sleeve up or down upon the stem, said sleeve having an ofiset transversely channeled box, a crank shaft and elastic flexible double acting connections between the crank and the box, a collar through which the stamp stem is slidable, an inclined feather and grooved clutch connection whereby each reciprocation of the stem will cause it to turn, and a containing casing for said clutch connections yieldingly mounted to compen sate for transverse irregularities of movement of the stamp stem.

3. In a stamp mill, a guided rising and fall ing stamp stem, adjustable collars thereon and an inclosed sleeve within which said stem is turnable and through which movement is transmitted to reciprocate the stem, a spirally grooved sleeve fixed to the stem, a collar with lugs engaging said grooves a casing surrounding the collar, a clutch mechanism carried therebyand acting to intermitteiitly rotate the stamp stem, a support upon which the casing is movable transversely, and a link connecting the movable casing with a fixed support.

4. The combination with a rising and falling stamp stem, and a turning and. clutch mechanism, of a spirally grooved sleeve. removably secured to the stamp stem, and a transversely movable casing within which the turning mechanism is contained.

5. In an apparatus of the character described, a rising and falling stamp stem, a revoluble crank shaft with connecting rod, an interposed double-acting spring and a box with which the spring is connected, a sleeve offset from the box within which the stamp stem is turnable, collars adjustably lixed to the stamp stem above and below the sleeve, a fixed guide yoke, a casing carried by the yoke having a free transverse movement relative thereto, a link whereby said movement is limited and a stamp turning mechanism carried by the casing.

In testimony whereof I have hereunto set my hand. in presence of two subscribing witnesses.

FRANCIS I. MATTHEWS.

Witnesses S. H. NOURSE, FREDERICK E. MAYNARD. 

